Two Reihana penalties and a Soane Tonga'uiha try put Northampton further ahead before the Chiefs rallied.
His team-mates Phil Dowson and Soane Tonga'uiha are contenders, with Sarries duo Schalk Brits and Ernst Joubert.
But Tonga'uiha had made it clear that he wanted to remain at Northampton.
Saracens had felt aggrieved over Tonga'uiha's U-turn and had sought to persuade the 28-year-old to honour his agreement with them.
After the latest in a series of surging attacks giant Tongan prop Tonga'uiha looked as though he had rumbled over.
Two Shane Geraghty kicks kept Saints in touch before, with a minute left, the TMO ruled Tonga'uiha had knocked on.
Northampton stormed upfield from the restart and Tonga'uiha turned provider, slipping Dickson the ball and the scrum-half scampering over for a try.
Tonga'uiha has blossomed into one of the most effective players in the Guinness Premiership since moving to Franklin's Gardens from Bedford in 2006.
Akapusi Qera scored first for underdogs Gloucester, barging over from close range, before Soane Tonga'uiha finished off a sweeping move at the other end.
There was no let-up in the pace, however, with man-of-the-match Tonga'uiha intercepting in his own 22 and rampaging 60 yards before shipping the ball inside.
Saints hit back immediately, Shane Geraghty, playing at full-back, counter-attacking from deep and initiating a sweeping move which ended with loose-head prop Tonga'uiha burrowing over.
Hudson Tonga'uiha also dropped a goal as much-changed Leeds were stunned.
And, although Lennard failed with the kick, Tonga'uiha stepped up the plate in stoppage time to add the drop-goal that stretched his side's lead to 11-0.
The television match official studied the replay before deciding Tonga'uiha had knocked on as he went over, which meant Courtney Lawes's follow-up effort was also discounted.
Northampton continued to work hard and their second try came midway through the half as the pack drove over from a lineout, Tonga'uiha coming up with the ball.
"I'm very happy to sign again with Saints, " said Tonga'uiha.
Sarries chief executive Edward Griffiths claimed Tonga'uiha's deal with Northampton was illegal and took his club's case to the Premiership's governing body, who asked for reports from both clubs.
Sarries chief executive Edward Griffiths says the prop's new deal is illegal and irrelevant and has taken up Tonga'uiha's U-turn with the governing body of the Guinness Premiership, who have now asked for written reports from both clubs.
Tom James was the next to clash with the ever-spikey Hartley, but it was the Northampton front row's dominance at the scrum - man-of-the-match Soane Tonga'uiha outstanding - that helped the depleted visitors secure another penalty for Myler to level the game at the break.
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